This document provides instruction on evaluating algebraic expressions. It begins with defining key terms like expression and evaluation. Students are shown examples of expressions and how to evaluate them by substituting values for variables. The lesson includes examples of evaluating expressions, as well as an in-class assignment and exit ticket for students to complete. The objective is for students to learn how to evaluate an expression by substituting a variable with a known value.

1. Unit 4 - Algebra
Expressions and Equations- Lesson 2
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

2. • C:UserspthompsonDesktopMath
DepartmentAssessmentsUnit 4 (Algebra)Tier 2 Words
for Unit 4 in 7th Grade Math.docx
Let’s take a look at the
vocabulary that we will
use to describe our
thinking in Algebra!
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

3. Why is “X” used as the
What is Algebra? unknown?
• http://www.youtube.com/ • http://www.youtube.com/
watch?v=_pEQiUSu62I watch?v=YX_OxBfsvbk
You might want to
remember this! ;-)
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

4. Game Time!
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

5. Turn and
Why is it important to Talk!
come to a certain
agreement on procedural
rules (in sports/games,
language, mathematics)?
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

6. Expression Examples of expressions
• Expression- A number • 5x – 3
or combination of • 2+2
numbers and symbols • B
that stand for a value • 5
• 7-x
• 18a
• 25÷5
Expression-Let’s take a
look
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

7. Now that we know what
expressions are, let’s
learn how to evaluate
them… but what does it
mean to evaluate
something?
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

8. Evaluate Example of evaluation
• Evaluate- To look at • b= 5
information or facts and
make a decision based on • b–3
the information given
• When I evaluate this
expression I see that the
expression is 2, because
b=5 and 5-3 is 2
Evaluating is easy!
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

9. Evaluate Answer:
b= 7
b + 10
7 17
Now you try!
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

10. • Work independently to complete the in-class work
on Evaluating Expressions
• Your teacher will monitor your progress while you
work
• When you finish, please work on Math
Minutes, Complete corrected homework, or Read
your choice book
• Do Not raise your hand. Look at your notes for
help or skip the question and work on a different
question until your teacher comes to your desk.
In-Class assignment…
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

11. • What is something that I learned in today’s lesson
that I didn’t know how to do that I now know how to
do?
• I wonder…
Exit Ticket…
Objective: Students will learn to evaluate an expression by substituting a variable
with a known value

12. Objective: Students will learn to evaluate an expression by substituting a variable
with a known value